Question

A laptop computer uses 78.0 W of power. If it runs for 10.0 minutes how much energy does it use?

Answer 1

Answer: 46800

Explanation: P (power)=E (energy) divided by t (time, in seconds).

P in this problem is 78.0, energy is our unknown, and time is 600 seconds. (10 minutes times 60 seconds is 600 seconds)

Therefore, our problem looks like this:

78.0=x/600

The answer to that equation is 46800

Hope this helps anyone who needs it!

Answer 2

Power consumed = P = 78.0 W
Time taken = t = 10 minutes
Energy consumed = E = ?

The power, energy and time are related by the following equation:

P = E / t

Using the values, we get

78 = E/t

So,

E = 780

This means, 780 Joules of energy was used during the 10 minutes